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Harden NixOS config defaults and setup guidance #4

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Copilot merged 13 commits from copilot/review-nixos-setup-issues into main 2026-02-01 21:17:59 +00:00
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8
README.md
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@@ -138,10 +138,10 @@ sudo nixos-rebuild boot --profile-name gaming --flake .#gaming
Generate a password hash and save it to `/etc/nixos/secrets/<username>/password.hash` (replace `<username>` with your actual username):
```bash
sudo mkdir -p /etc/nixos/secrets/john
sudo chmod 700 /etc/nixos/secrets/john
mkpasswd -m sha-512 | sudo tee /etc/nixos/secrets/john/password.hash
sudo chmod 600 /etc/nixos/secrets/john/password.hash
sudo mkdir -p /etc/nixos/secrets/<username>
sudo chmod 700 /etc/nixos/secrets/<username>
mkpasswd -m sha-512 | sudo tee /etc/nixos/secrets/<username>/password.hash
sudo chmod 600 /etc/nixos/secrets/<username>/password.hash
```
### Setup MangoWC

2
flake.nix
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@@ -43,7 +43,7 @@
usernameValid =
builtins.match "^[a-z_][a-z0-9_]*$" username != null
&& builtins.match "^_+$" username == null
copilot-pull-request-reviewer[bot] commented 2026-02-01 21:21:01 +00:00 (Migrated from github.com)
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The username validation regex allows usernames that consist only of underscores followed by other characters (e.g., "___abc"), but the second check builtins.match "^_+$" username == null only rejects usernames that are entirely underscores. According to standard Unix username conventions, usernames starting with underscore are typically reserved for system accounts. Consider strengthening the validation to reject any username starting with underscore unless that's intentionally allowed for system accounts.

      builtins.match "^[a-z][a-z0-9_]*$" username != null
The username validation regex allows usernames that consist only of underscores followed by other characters (e.g., "___abc"), but the second check `builtins.match "^_+$" username == null` only rejects usernames that are entirely underscores. According to standard Unix username conventions, usernames starting with underscore are typically reserved for system accounts. Consider strengthening the validation to reject any username starting with underscore unless that's intentionally allowed for system accounts. ```suggestion builtins.match "^[a-z][a-z0-9_]*$" username != null ```
&& builtins.match "^nix" username == null
&& builtins.match "^nix.*" username == null
&& username != "root";
hostConfig = (./hosts + "/${hostname}") + "/hardware-configuration.nix";
passwordHashPath = "/etc/nixos/secrets/${username}/password.hash";